witzel



A. WITZEL.

RUBBEHNTIRE.

APPLICATION FILED MAR- 10.1920.

1,419,343, PatentedJune 13,

3 SHEETS-SHEE I -"n @i A. WIT RUBBER APPLICATION H 0. 1,419,343,Patented June 13, 1922.

a SHEETS SHEET 2.

A. WITZEL.

RUBBER TIRE.

APPLICATION FILED MAR. 10.1920.

419 343 1 PatentedJune 13, 1922.

3 SHEETS-SHEET 3.

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UNITED STAT i ATENT OFFICE.

ALBERT WITZE'L, OF LUJJEVIGSBURG, GERMAJETY.

Specification of LettersPatent- Patented June 13, 1922.

Application filed March 19, 1920.

Serial No. 384,869.

(GRANTED "UNDER THE PRQTJZUIQNSD 01? THE I101 9E3 iii/ARCH 3, 1921, llSTAT. 1., 1313.)

l lngland (lot. 29, 1919, Patent N o.

Aug. 2?, 19M): Sweden A jl9l9,l atont No.

Denmark ring. 12 Noiwvav ltiflfli; ilrance ilcpt. 1919, Patent No.519,520: tali; fine. 25 i919; Spain Ana.

Y 2&5 1919. Patent No. 70.74.! Belgium Sept. 4:. i919; Holland Qlan.123. 921 Polen Mar. 2, 1920). of which the "Following is aspecilication.

This invention relates to a hollow rubber tire for motor cars andsimilar vehicles which is of the same elasticity as a pneumatic tire.although compressed air is not used. but is without the well knownincoin veniences oi the pneumatic tires.

Tn order to attain this, transverse vault; shaped streng tliening ribs.starting eventuallw from two sides, are provided upon the inner surfaceof the mantle. the lower ends of which rest upon the lower part of thetire which is less elastic than the uppe '-or rmter-part oi" the tire sothat the strengtheninc ribs are well supported. Only the smaller part oithe hollow chamber is situated in the outer elastic part of the ti re,its principal part being, located in the nnclastic inner part oi thetire. The strenetlicnin r ribs are not only con'iprcssed under the loadbut. owing; to the novel arrangement and manner oi support, bent likeelastic rods so that a perfect elasticity is obtained. the completecompression of the hollow chamber being prevented even under thestrongest pressure or shocks.

In order to maintain the elastic tire securel upon the rim. a circularrubber ring. which is either made in one piece or composed or severalsegments, is arranged be low the hollow chamber. said rin g having;shoulders engaging: shoulders on the tire and. beinesecured upon the rimthrough screws. To prevent the tire from creeping: on the rim beads areprovided which enwith corresponding grooves of the rim.

In the accompanying; drawing the inven tion is shown by way of examplein several difierent forms of construction.

Figs. "t and 2 are cross sections showing two dilit'erent forms of:construction.

Fig. El is a longitudinal section with end cross section. showing athird form of construction of the improved tire.

i and 5 are cross sections through a fourth form ot construction.

Fig. (5 is a plan view. partly in sectiom of a point at which the tireis lined.

Figs. 7 to 9 are cross sections oil two further terms oi construction.

The rubber tire a has. in the well known manner, a continuous hollowchamber. The top wall. (it the chamber is titted with vaul shapedtransverscs strengthening: ribs 7) oi any convenient position. In theterms oi construction shown in l igijs. l. and 2 the ribs Ki stand atright angles to the tire. Accord ing; to Fig. 3 they are spiral-shaped;they could however have an other transverse direction and could "torexample. stand dis agonally any desired angle or at different angles theone with regard to the other so that they cross one another.

The strengthening ribs or vaults 7) rest with their ends upon the lowerpart c of the tire. in order to increase the resistance of the tire thelower or inner part c of the same is made oi less elastic in atcrialthan the outer part (Z. The part oi the hollow chamber formed by thevault-shaped strengthening ribs 7). which is situated above a line a m,m, w, and consequently belongs to tho-elastic part d of the tire isironsidcrablv smaller than the part which situated below the said lineand belongs to the lower part oi the tire.

To prevent giving" way in lateral direction of the lower part 0 ol thetire n. this lower part c is gripped within solid removable flanges cheld together by screw bolts f;

The circular hollow chamber can either be closed at the bottom or innerend by a ring; ,7 (Fig. 1) or by flange-like extensions 72 of. the inneredges of the mantle which come in contact at the middle (as shown inFig. 2).

The tire can have heads a" on either side designed to tit into circulargrooves of the rim ]c (Fig.

In the forms of construction shown in Figs. l-9 the ring 9 servesfurther for fastoning); the tire a upon the rim k, and to prevent thecreeping; of the tire upon the rim.

For the first named purpose the ring which can be continuous or composedor several segments, has lateral shoulders Z which press upon the edgesh oil? the tire a. The ring 9 is pressed against the rim 76 by means ofa number of screws m. Screwed sockets it vulcanized into the ring 9serve for receiving the said screws rm, said sockets having extensions 0designed to engage with the lateral shoulders Z of: the ring g. In orderto still better prevent the creeping the screwed sockets a arepreferably made to engage with corresponding indentations of the rim 7c,the ring f/ having further at the points where it is lined lateral flaps7') designed to engage with corresponding indentations (I of the tire a.To prevent the giving way of the tire a in lateral. direction, removableside flanges e are provided which grip over beads z" oi: the tire a.

According to the forms of construction illustrated in Figs. 4t to 6, thering 9 is of wedge-shaped cross section, the flaps 2) extendinglaterally therefrom.

In the form of construction shown in Figs. 7 and 8 the lateral.flange-lihe shoulders Z. oi the ring 9 are suppressed and the flaps 3)form strong jaws.

Fig. 9 shows the form of construction in which vertical sides are used.

I claim 2- l. A rubber tire having a central opening therein, a treadportion and a base portion, the former being more resilient than thelatter; and transverse strengthening ribs on the internal surface of thetire, said ribs being disposed at an oblique angle relative to themedial plane of the tire, the terminal portions oi the ribsresting onthe less resilient base portion of the tire.

2. The combination with a rim; of a rubber tire mounted thereon andhaving a central opening therein, a tread. portion and a base portion,the former being'more resilient than the latter; transversestrengthening ribs on the internal surface of the tire, said. ribs beingdisposed at an oblique angle relative to the medial plane of the tire,the terminal portions of the ribs resting on the less resilient baseportion of the tire; and a ring for maintaining the tire on the rim,said ring having lateral extensions for engaging the side edges oi? thetire near the base portion thereof.

3. In combination, a rubber tire having a central opening therein, atread portion and a base portion, the former being more resilient thanthe latter; transverse strengthening ribs on the internal surface of thetire, said. ribs being disposed at an oblique angle relative to themedial plane of the tire the terminal portions 01 the ribs resting onthe less resilient base portion of the tire; a rim tor the tire; andmeans for preventing creeping of the tire on the rim.

In testimony whereof I afiiX my signature in presence of two witnesses.

ALBERT 'WI'lZEL.

Witnesses: I

ERIKA HALTER, MARTHA Hansen.

